Vol. 6, No. 1, 2013

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Localisation and compactness properties of the Navier–Stokes global regularity problem

Terence Tao

Vol. 6 (2013), No. 1, 25–107
Abstract

In this paper we establish a number of implications between various qualitative and quantitative versions of the global regularity problem for the Navier–Stokes equations in the periodic, smooth finite energy, smooth H1, Schwartz, and mild H1 categories, and with or without a forcing term. In particular, we show that if one has global well-posedness in H1 for the periodic Navier–Stokes problem with a forcing term, then one can obtain global regularity both for periodic and for Schwartz initial data (thus yielding a positive answer to both official formulations of the problem for the Clay Millennium Prize), and can also obtain global almost smooth solutions from smooth H1 data or smooth finite energy data, although we show in this category that fully smooth solutions are not always possible. Our main new tools are localised energy and enstrophy estimates to the Navier–Stokes equation that are applicable for large data or long times, and which may be of independent interest.

Keywords
Navier–Stokes equation, global regularity
Mathematical Subject Classification 2010
Primary: 35Q30, 76D05, 76N10
Milestones
Received: 4 August 2011
Revised: 7 August 2011
Accepted: 23 May 2012
Published: 1 June 2013
Authors
Terence Tao
Department of Mathematics
University of California, Los Angeles
Los Angeles, CA 90095-1555
United States